更正被推荐答案,正确答案为C

解释：
1. 前句为make good use of...的被动句,即主动句为：He has made such good use of his spare time
而整句为一个such...that...句型“如此...,以至于...”,所以第二空肯定是that.
由此排除BD；
2. 很明显,主句的被动句变化为：Such good use has bee made of his spare time
所以排除A,C为正解.
3. 因为此句为被动句,所以such good use为句子主语,故没有采用倒装语法.
主动句倒是可以倒装为：Such good use has he made of his spare time that...